MA180023 Microchip Technology, MA180023 Datasheet - Page 234

• Manufacturer Part Number: MA180023
• Description: MODULE PLUG-IN PIC18F46J11 PIM
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of MA180023

• Accessory Type: Plug-In Module (PIM) - PIC18F46J11
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: PIC18
• Supported Devices: Stand-alone Or W/ HPC(DM183022) Or PIC18(DM183032)
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18FxxJxx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: HPC Explorer Board (DM183022) or PIC18 Explorer Board (DM183032)
• For Use With: DM183032 - BOARD EXPLORER PICDEM PIC18DM183022 - BOARD DEMO PIC18FXX22 64/80TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F46J11 FAMILY
16.2.2
As mentioned earlier, the RTCC module is intended to
be clocked by an external Real-Time Clock crystal
oscillating at 32.768 kHz, but also can be clocked by
the internal RC oscillator. The RTCC clock selection is
decided by the RTCOSC bit (CONFIG3L<1>).
FIGURE 16-4:
16.2.2.1
The RTCC module can be clocked by an external,
32.768 kHz crystal (Timer1 oscillator) or the internal RC
oscillator, which can be selected in CONFIG3L<1>.
If the external clock is used, the Timer1 oscillator
should be enabled by setting T1CON<3> (T1OSCEN).
If INTRC is providing the clock, the INTRC clock can be
brought out to the RTCC pin by the RTSECSEL<1:0>
bits in the PADCFG register.
16.2.3
This section explains which timer values are affected
when there is a rollover.
• Time of Day: From 23:59:59 to 00:00:00 with a
• Month: From 12/31 to 01/01 with a carry to the
• Day of Week: From 6 to 0 with no carry (see
• Year Carry: From 99 to 00; this also surpasses the
DS39932C-page 234
32.768 kHz XTAL
from T1OSC
Internal RC
CONFIG 3L<1>
carry to the Day field
Year field
Table 16-1)
use of the RTCC
Note 1:
CLOCK SOURCE
DIGIT CARRY RULES
Writing to the lower half of the MINSEC register resets all counters, allowing fraction of a second synchronization;
the clock prescaler is held in Reset when RTCEN =
Real-Time Clock Enable
CLOCK SOURCE MULTIPLEXING
Second
Clock Prescaler
Hour:Minute
1:16384
(1)
0
.
Day of Week
module to yield an error of 3 seconds or less per month.
Calibration of the crystal can be done through this
(For further details, see Section 16.2.9 “Calibration”.)
For the day to month rollover schedule, see Table 16-2.
Considering that the following values are in BCD
format, the carry to the upper BCD digit will occur at a
count of 10 and not at 16 (SECONDS, MINUTES,
HOURS, WEEKDAY, DAYS and MONTHS).
TABLE 16-1:
Half-Second
Clock
Day
Wednesday
Thursday
Saturday
Tuesday
Monday
Sunday
Friday
Half Second
DAY OF WEEK SCHEDULE
Day of Week
Month
© 2009 Microchip Technology Inc.
(1)
One-Second Clock
Year
0
1
2
3
4
5
6